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AD9709 Datasheet(PDF) 11 Page - Analog Devices |
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AD9709 Datasheet(HTML) 11 Page - Analog Devices |
11 / 20 page ADL5370 Rev. 0 | Page 11 of 20 BASIC CONNECTIONS Figure 25 shows the basic connections for the ADL5370. VPS5 VPS3 VPS4 VPS2 VPS2 VOUT COM1 VPS1 COM1 VPS1 VPS1 VPS1 1 2 3 4 5 6 18 17 16 15 14 13 VOUT C13 0.1µF C11 OPEN C12 0.1µF CLON 100pF C14 0.1µF C15 0.1µF C16 0.1µF COUT 100pF VPOS QBBP QBBN IBBN IBBP EXPOSED PADDLE CLOP 100pF LO GND Z1 ADL5370 Figure 25. Basic Connections for the ADL5370 Power Supply and Grounding All the VPS pins must be connected to the same 5 V source. Adjacent pins of the same name can be tied together and decoupled with a 0.1 μF capacitor. These capacitors should be located as close as possible to the device. The power supply can range between 4.75 V and 5.25 V. The COM1 pin, COM2 pin, COM3 pin, and COM4 pin should be tied to the same ground plane through low impedance paths. The exposed paddle on the underside of the package should also be soldered to a low thermal and electrical impedance ground plane. If the ground plane spans multiple layers on the circuit board, they should be stitched together with nine vias under the exposed paddle. The Analog Devices AN-772 application note discusses the thermal and electrical grounding of the LFCSP_VQ in greater detail. Baseband Inputs The baseband inputs QBBP, QBBN, IBBP, and IBBN must be driven from a differential source. The nominal drive level of 1.4 V p-p differential (700 mV p-p on each pin) should be biased to a common-mode level of 500 mV dc. The dc common-mode bias level for the baseband inputs may range from 400 mV to 600 mV. This results in a reduction in the usable input ac swing range. The nominal dc bias of 500 mV allows for the largest ac swing, limited on the bottom end by the ADL5370 input range and on the top end by the output compliance range on most digital-to-analog converters (DAC) from Analog Devices. LO Input A single-ended LO signal should be applied to the LOIP pin through an ac-coupling capacitor. The recommended LO drive power is 0 dBm. The LO return pin, LOIN, should be ac-coupled to ground through a low impedance path. The nominal LO drive of 0 dBm can be increased to up to 7 dBm to realize an improvement in the noise performance of the modulator. This improvement is tempered by degradation in the sideband suppression performance (see Figure 20) and, therefore, should be used judiciously. If the LO source cannot provide the 0 dBm level, then operation at a reduced power below 0 dBm is acceptable. Reduced LO drive results in slightly increased modulator noise. The effect of LO power on sideband suppression and carrier feedthrough is shown in Figure 20. The effect of LO power on GSM noise is shown in Figure 35. RF Output The RF output is available at the VOUT pin (Pin 13). This pin must also be ac-coupled. The VOUT pin has a nominal broadband impedance of 50 Ω and does not need further external matching. |
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